P2272Fuel & Air Metering

O2 Sensor Signal Stuck Lean Bank 2 Sensor 2

P2272 means the downstream O2 sensor on Bank 2 is reporting a stuck-lean signal, so the ECM cannot verify the catalytic converter on that bank. Usually a failing rear sensor or an exhaust leak.

🚗 Yes, short-term, but expect an emissions test failure.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Failing downstream O2 sensor$60-$300

45%

A contaminated or aged rear sensor sticks lean.

#2Exhaust leak near the sensor$50-$400

30%

Fresh air intrusion skews the reading lean.

#3Wiring/connector fault$50-$250

15%

Corroded connector or heater circuit issue.

#4Lean running condition$50-$500

10%

A true lean mixture pushes the reading lean.

🩺 Common Symptoms

Check engine light
Failed emissions test
Slightly worse fuel economy
No major drivability change

💰 Repair Cost: DIY vs Shop

DIY Cost

$60-$300

Shop Cost

$150-$500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2272

1Check for exhaust leaks near the Bank 2 rear sensor

2Read O2 sensor live data for stuck-lean behavior

3Inspect the sensor connector and heater circuit

4Replace the downstream O2 sensor if confirmed

❓ Frequently Asked Questions

Can I drive with P2272?

Short-term yes, but it will fail emissions.

How much to fix P2272?

Usually $150-$500 at a shop.

What causes P2272 most often?

A failing downstream oxygen sensor or an exhaust leak.

🔗 Related Codes

P2270P2271P2273P0156P0161